Cited 9 time in webofscience Cited 7 time in scopus

Optical properties of the iron-based superconductor LiFeAs single crystal

Title
Optical properties of the iron-based superconductor LiFeAs single crystal
Authors
Min, BH[Min, Byeong Hun]Hong, JB[Hong, Jong Beom]Yun, JH[Yun, Jae Hyun]Iizuka, T[Iizuka, Takuya]Kimura, S[Kimura, Shin-ichi]Bang, Y[Bang, Yunkyu]Kwon, YS[Kwon, Yong Seung]
DGIST Authors
Min, BH[Min, Byeong Hun]; Kwon, YS[Kwon, Yong Seung]
Issue Date
2013-07-16
Citation
New Journal of Physics, 15
Type
Article
Article Type
Article
Keywords
Dielectric FunctionsHigh Temperature SuperconductorsInter-Band TransitionIron-Based SuperconductorsLow-Temperature DataMetallic BehaviorsOptical ConductivityOptical Conductivity SpectraPlasma FrequenciesReflectivity SpectraSemiconductor Quantum WellsSingle CrystalsSuperconductivity
ISSN
1367-2630
Abstract
We have measured the reflectivity spectra of the LiFeAs (Tc = 17.6 K) single crystal in the temperature range from 4 to 300 K. In the superconducting (SC) state (T < Tc), the clean opening of the optical absorption gap was observed below 25 cm-1, indicating an isotropic full gap formation. In the normal state (T > Tc), the optical conductivity spectra display typical metallic behavior with the Drude-type spectra at low frequencies, but we found that the introduction of the two Drude components best fits the data, indicating the multiband nature of this compound. A theoretical analysis of the low-temperature data (T = 4 K < Tc) also suggests that two SC gaps best fit the data and their values were estimated as Δ1 = 3.3 meV and Δ2 = 1.59 meV, respectively. Using the Ferrell-Glover-Tinkham sum rule and dielectric function 1 (ω), the plasma frequency of the SC condensate (ωps) is consistently estimated to be 6665 cm-1, implying that about 65% of the free carriers of the normal state condense into the SC condensate. To investigate the various interband transition processes (for ω > 200 cm-1), we have also performed the local-density approximation band calculation and calculated the optical spectra of the interband transitions. This theoretical result provided qualitative agreement with the experimental data below 4000 cm-1 . © IOP Publishing and Deutsche Physikalische Gesellschaft.
URI
http://hdl.handle.net/20.500.11750/3221
DOI
10.1088/1367-2630/15/7/073029
Publisher
Institute of Physics Publishing
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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